treewide: Convert del_timer*() to timer_shutdown*()

Due to several bugs caused by timers being re-armed after they are
shutdown and just before they are freed, a new state of timers was added
called "shutdown".  After a timer is set to this state, then it can no
longer be re-armed.

The following script was run to find all the trivial locations where
del_timer() or del_timer_sync() is called in the same function that the
object holding the timer is freed.  It also ignores any locations where
the timer->function is modified between the del_timer*() and the free(),
as that is not considered a "trivial" case.

This was created by using a coccinelle script and the following
commands:

    $ cat timer.cocci
    @@
    expression ptr, slab;
    identifier timer, rfield;
    @@
    (
    -       del_timer(&ptr->timer);
    +       timer_shutdown(&ptr->timer);
    |
    -       del_timer_sync(&ptr->timer);
    +       timer_shutdown_sync(&ptr->timer);
    )
      ... when strict
          when != ptr->timer
    (
            kfree_rcu(ptr, rfield);
    |
            kmem_cache_free(slab, ptr);
    |
            kfree(ptr);
    )

    $ spatch timer.cocci . > /tmp/t.patch
    $ patch -p1 < /tmp/t.patch

Link: https://lore.kernel.org/lkml/20221123201306.823305113@linutronix.de/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Pavel Machek <pavel@ucw.cz> [ LED ]
Acked-by: Kalle Valo <kvalo@kernel.org> [ wireless ]
Acked-by: Paolo Abeni <pabeni@redhat.com> [ networking ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/scsi/qla2xxx/qla_edif.c b/drivers/scsi/qla2xxx/qla_edif.c
index 00ccc41cef14..e4240aae5f9e 100644
--- a/drivers/scsi/qla2xxx/qla_edif.c
+++ b/drivers/scsi/qla2xxx/qla_edif.c
@@ -416,7 +416,7 @@ static void __qla2x00_release_all_sadb(struct scsi_qla_host *vha,
 				 */
 				if (edif_entry->delete_sa_index !=
 						INVALID_EDIF_SA_INDEX) {
-					del_timer(&edif_entry->timer);
+					timer_shutdown(&edif_entry->timer);
 
 					/* build and send the aen */
 					fcport->edif.rx_sa_set = 1;
@@ -2799,7 +2799,7 @@ qla28xx_sa_update_iocb_entry(scsi_qla_host_t *v, struct req_que *req,
 			    "%s: removing edif_entry %p, new sa_index: 0x%x\n",
 			    __func__, edif_entry, pkt->sa_index);
 			qla_edif_list_delete_sa_index(sp->fcport, edif_entry);
-			del_timer(&edif_entry->timer);
+			timer_shutdown(&edif_entry->timer);
 
 			ql_dbg(ql_dbg_edif, vha, 0x5033,
 			    "%s: releasing edif_entry %p, new sa_index: 0x%x\n",